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1. turn power off.2. press the 6ch input and stereo button simultaneously for 4 seconds. Then while holding down these 2 buttons, turn the power on.3. press preset tuning to the right until option #9 is selected.4. Then, press program button until the *RV option is selected.5. turn power off, wait 10 seconds.6. turn power on, settings are reset.

Did you try to ask this question on the support forum from Onkyo? because I don't know what you mean with reset.
When a device is defect, there is no reset button, to repair it. Only what software is involved or settings in a memory that can lose settings when the power is down, can be "reset"Onkyo USA Support Forum Index page

Some recievers have both a "power switch" and a "stand by" switch. Here is the difference.
"Power switch" eliminates all power input and most likely the memory in the unit too just like your stating in your situation.
"Stand by" switch shuts down all major components but keeps a small ammount of power to the unit to conserve any stored settings

you may want to try a factory reset by pressing and holding vcr1 button while pressing the power button. do this with the unit on. It will reset back to factory default. so any saved setting will be lost and you will have to set again to your settings.

Yes, there is. Unplug the power cord from the wall outlet, thenplug it back in while holding down the POWER ON/STANDBY key.That will clear the contents of the memory, reset the microcomputer and take the unit back to factory settings. Hope this helps. Let me know.